Shell and core for crushing-rolls.



No. 808,004. PATENTED DEC. 19, 1905. W. G. BRYANT.

SHELL AND GORE FOR GRUSHING ROLLS.

.ing of one from the other and also to remove WALTER G. BRYANT, OFGARTERVILLE, MISSOURI.

SHELL AND CORE FOR ORUSHlNG-ROLLS.

Specification of Letters Patent.

Patented Dec. 19, 1905.

A licati fil d March 14, 1905. Serial No. 250,106.

To all whom it may concern:

Be it known that I, WALTER G. BRYANT, a citizen of the United States,residing at Carterville, in the county of Jasper and State of Missouri,have invented a new and useful Shell and Core for Crushing-Rolls, ofwhich the following is a specification.

This invention relates to crushing-rolls for ore-mills.

The objects of the invention are in a simple, ready, thoroughlyfeasible, and practical manner to prevent the shell from working loosefrom the core, to obviate the neces sity of wedging the shell to thecore around the entire diameter of the latter, to remove practically allof the strain from the keys employed in combining the shell with thecore, to extend the life of the shell, and generally to simplify theconstruction and increase the efficiency of crushing-rolls, cores, andshells.

With the above and other objects in view, as will appear as the natureof the invention is better understood, the same consists in the novelconstruction and combination of parts of a cruslfing-roll, as will behereinafter fully described and claimed.

In the accompanying drawings, forming a part of this specification, andin which like characters of reference indicate corresponding parts,Figure 1 is a view in perspective of a shell and core combined with ashaft exhibiting the present invention. Fig. 2 is a perspective detailview of the core and shaft, showing, further, the relative dispositionof the keys. Fig. 3 is a view in side elevation of the shell.

Referring to the drawings, 1 designates the roll-shaft, 2 the core, and3 the shell. As usual, the core is made of soft gray iron and the shellof chilled iron or steel.

The present invention resides in the novel manner in which the core andshell are held combined so as positively to preclude loosenpracticallyall the strain from the keys or wedges and transfer it to the walls ofthe bore of the shell. As herein shown, the core is polygonal incross-section, preferably an irregular octagon, although it may be ofany other polygonal form that may be desired, and is provided in thisinstance in four of its spaces with longitudinally-extending keyseats 4,the bottoms of the successive seats converging to the roll-axis fromopposite ends of the roll, so that when the keys 5 are positioned anytendency on the part of the core to shift relatively to the shell or thelatter to shift relatively to the core Will be positively prevented, asthe shell will be wedged against any movement in all directions. Theshell is provided in the wall of its bore with four longitudinalkey-seats 6, which are of the same depth throughout their entire length.The coaction between the core and the shell is accentuated by the factthat the keys 5 are of wood and will swell when wet, and thus firmlyengage all of the walls of the seats in the core and the shell.

In practice the bore of the shell will be of the same diametertlnoughout, as also the core, and it is further designed that theseparts shall have a neat fit, so that when in operation the strain uponthe shell will be transferred to the faces of the core and not to thekeys, these latter serving principally as a means of holding the partsassembled and not of withstanding any torsional strain.

As usual, the core is provided with a longitudinal bore, in which isfitted the shaft 1, which is held in position therein by a plurality ofkeys, (in this instance two, designated 7 and 8,) the object foremploying more than one key being to guard against any separation of thecore from the shaft, it being apparent that while it is possible for onekey to work loose the working loose of both would be practicallyimpossible.

Heretofore in combining a shell with a core it has been the practice tomake the core of less diameter than the shell and to drive wooden wedgesin between the two parts around the entire periphery of the core. Thisis not only expensive and troublesome, but it is not thoroughlyeffective for preventing the shell from working loose upon the core.From the present procedure, it will be seen that when the shell is to becombined with the core it will only be necessary to provide four keys inthis instance, although, as will be obvious, a greater or less numbermay be employed to secure the shell and core positively together.

I elaim 1. A crushing-roll core polygonal in crosssection and providedwithlongitudinal wedgekey-seats, the bottoms of the successive seatsconverging to the roll-axis from opposite ends of the roll.

2. A crushing-roll polygonal in cross-section and provided withlongitudinal wedgekey seats extending throughout its entire length, thebottoms of the successive seats converging to the roll-axis fromoppositeends I key-seats to register with those of the core, to of the roll. andkeys engaging the seats.

3. A crushing-roll core polygonal in cross- In testimony that I claimthe foregoing as section and provided with longitudinal keymy own I havehereto affixed my signature seats extending throughout its entirelength, I in the presence of two Witnesses. the bottoms of thesuccessive key-seats converging to the roll-axis from opposite ends ofthe roll, in combination With a shell having a polygonal core-engagingbore provided with WVALTER G. BRYANT.

Witnesses:

CHARLES INNIS. FRANK B. LOOMIS.

